Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef33eeede62b803ca0ff66a90f6c32b33eeec2de9dd917325dbdf1c09877489' 
  AND token = 'PYhYjcLUsxiIk3QByZwNl7iulOr9D0gL+vijpSb70vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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