Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefed1255bcfccc4c0f2b0c427ddfab0de4abb0574294c5dab2180e8301ec33d' 
  AND token = 'eCiGkA8EKK9jeJ1wsGBCCVdqJZ92ncTBxf8hpJfk9fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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