Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635d645750f00a0c8e9eedadfc2aff24ae9776ab6ef4f938e0f47bca23a26277' 
  AND token = 'uLEFIrEhq0b1EBRa9MUlmnmlMe5SwNXRg6hy76T81mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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