Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c57ea8df442d7320073c6098f2164d30ca6646feacf6bea20316399fe98ff2' 
  AND token = 'PeIStY2RsMTK2ttyKm8K3Jvv2USG56CgSM9mzE+/D4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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