SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c88bbbf1b3b26273058395165a4d601ddab894dd8eed22272543ac8e376aaffa' 
  AND token = 'boGRv3cZVIIZ4sZwDQfxEr/uwpFbFlze9FUW1/R0o4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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