Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a0c6a4880074cb4fa47beb7b3ae7f76f833330c8c2b2dfc3f47e18b4bc53c8' 
  AND token = '+WczXz2N2BEfxmosBFPlpZC6LWgRLTS6bCY2k4cC6iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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