SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c6631b163839b4950d39ee65235c8a7c0c4a1bf7a9b6e6e223702105a471f6e' 
  AND token = 'AVfTz68EAw/4j+GGjGLJEXpHbWKpooK9Ixx3Qb8AttI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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