Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e654be620e01239a8b671ce083b7b064829c4f7f6a56762de8ec0ecc23ef7bb' 
  AND token = 'iTRfT+i4Ia0oxp+Gb8nbxzyS6/s1wr/WqoME64kLGAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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