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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5a36f37dadd2f6a5e863551526087ba2e289c8b13786cb15117bfb6eb32cb989' 
  AND token = 'mcXjQRLeR7I0U/yiAz0Ke87H5K62HIE24J560YvsJvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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