SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f3fbe09f27c331f8a84ea0a0e4a8500d5eb42937b61399c0f530542985191056' 
  AND token = '8PL44l+DrtxcF9rKJrWbxMTBBPq8FaN2uZJCjvRDRSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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