Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a3ae860ef417221683f1dd2268b8d7ae70345cee986acd9c8623d32a57b91f' 
  AND token = '1ZsbHrTgFXqWb0qtcB1FS5TIuOmXXz39D6vlqD+3vyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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