SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '490401c414842e1be19eb70c40bf34b952a62d681a88065c6f464be811adff6b' 
  AND token = '+K/g9sW3vNBE5/iGZbGHfaAkYAK3UGM55YHh9S9AVBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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