Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa706f4526936a77d33eac9d9d13db96d35a5054b3be95f64fcc7e7097ebd54d' 
  AND token = 'MLntyUYiAzFJYsaAQ/EaubRlHA2E+/fa3ljMoQ2GUFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}