SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '522b5b70698ab8ecfefd9835d20f804d9f21dfa67446370050a72bace546b08f' 
  AND token = 'fvxYpizNBjmzDN2xdFDxYeazVLC7Z54RAU1FESLOILA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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