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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '78a9633aec253e89e631179343bbbbf15a87af28908ad14a212509c68b92e421' 
  AND token = 'PYPuyOjH9Z4wESHakTt/KrRN+yihDMC/Q2jCay/4MLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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