SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0c37e307a31b4905f4ad32d39e9bdccd6f7187c24fde4c29eea87bba753c9fa8' 
  AND token = 'zSbm1VF/z4oNb7ZX1/HbGgrGUrzj+zXxhv1Rnm3yMWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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