Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31304f6880a83493e3bd2302c01fd65513d6398f66e22e25908dfb0eefba1ccf' 
  AND token = '5WRcQjMIUQ1fR9/4BtI0DAigC5/DOAxs0bJYXtCAvQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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