Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0dc37e7ce8ecc898140e2eb2ec76bd251831a8f30980733e62f1852681d02ad' 
  AND token = 'PWcjbHGsfqUb5i9RFasrAzdJD5f+rDF6e2LzD6Uf2fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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