Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef1dca4b8cffef7e5bcb424f80aee063fecb50f5b31d0c8d11a760fb5b26ba5' 
  AND token = 'nYLpidnuGwlzIZuhFUIP/QI4cfAVWd0xxhveRDM7hJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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