Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c9c1763be52c4c33ad432e80680c309817bbe6230afc6cf1f58cbdaf75b843' 
  AND token = 'y9hj1khmdpOu0mdXKaGih26WygcqLn/wPHH48eHm/p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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