Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a81805ffc66a7c92992fc4a36d02954f2176783fc99d1b15901a55321b1fe8' 
  AND token = '7ejgdns4GeXMhjhPDPKI7sZ1ll5TDZVNRFp9R0anSow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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