Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121ef68a09d0f2fd297a85ab7dac9fbfe2174c74e86efe2810ed2753d06d35f8' 
  AND token = '8QAFP2qSy24rs9+kOwpIQSHSj1co1gAGDHX0ej5Fl3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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