Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8cb71647236b44aab16dab4fd9726bee6cfe7c42cd3322c9e3a924a7a8c829f' 
  AND token = 'c/wG+Up6KCIswi0ZweZdrsR/ENCbYi4CgCBKF4dEd+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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