Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19dcdc4d68851d50e9bf13a844ef2188eb41e77d86c8f0370aefe1827291757' 
  AND token = 'm/AcBhkoZ9f2O8meVXjElcGxqlsNGazBadrl1ag3E3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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