Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b1c45661305e426363bacb6e938d6489beeb105103dc658aa3526039dec956' 
  AND token = 'kuoFBqNi9qk8iRmp2nquEvrnIFrwVLc0od1zPCfaIU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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