SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e740a92cf5d5e09f2bac92e02436c76fbae1b29248893c8cda187e66e040d055' 
  AND token = 'JjYSdHvzX91CDInFZJJ7LF878ZHcoJ8sjxxZmRIKR1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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