SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9ae9dca4ae8e011cf4c96da7a643cddf0ac2e307a444e521a54562351a34fb76' 
  AND token = 'iVkh/PKU4fGIj+0GlZKZmCGg6ub3sgr6OSiwTYg1dIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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