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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bac2d884fab3224a871891436b172a1f855af13e0cd056cc8fa75f9ed76d265f' 
  AND token = 'KsMC4bYpaXyrTYlSB9V9/niEIyKTAQ6IceCElHihrbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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