Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc02eb9d3589f60ddbecf5b5b7a1f3c0a5e0164e03b5a73be5763bfda55aa515' 
  AND token = '8aSkjlooBsjlxOPd8APmlQKGVE7p7C8KuAkCOdI5YBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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