Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bd70ea8bffddae57f6c9b3188e5f19a041be63e95cbe9aac67205940c7a31d' 
  AND token = 'MDdgYmOy0o5oDJniFusvGKoz8VdLiL5xl1MA7F0P+MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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