Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48781c0e2e39f617c7537feeaeb7b239eff2b459feb6d2207b5cc8f9dd363cf' 
  AND token = 'MPSKNdWM4r4H8R0co8QJsJGa9ZfQnu6R/O0QFW3h4ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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