Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5efa9bf3313fa53efe2fa0354ddbca6b320721f60d839906c1a0597adc6456' 
  AND token = 'kyCqGngRNgLONLHro/b2c9w8+YQgeefgZ+gZaRn2BZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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