Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19425c3d7fd24bbda68818f17ba85be13a3240f4a35d0f96047e39f1c9e7ad3' 
  AND token = 'T2PSr6CMeMBswGiQ8mLvCVOnAjtEAiBjd3DrHNW9nCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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