Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c754c8dc5a58e3218d65857b3da1ac65f35ff4c58b58c3bc1ef7d4b97838e7b' 
  AND token = '2N9VBzLOp7bP9XAejfUyPHLA7pmILjIcT3xJ/BiAZ2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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