Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e49daae072755d22ce0998eddbd44b3f309b1f1cc2b4b0809e20105fa340a4' 
  AND token = '+ZhGYsyteQ0Bk/kh1G7mW+NHZFDtehEDcZ/5ceDdTDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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