SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a235d06bcffe781220f0cb327beddb0493f0feac91095902448426e0b9925a5c' 
  AND token = 'Jv+ikHOSTZXK5Tj9eZ3cLAlSg0VlulnpBk6rFBqZxjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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