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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2c60e95b28c6ed0a612d9e768261553aea8ff371c219607fb45fc10011b1442' 
  AND token = 'pnEQLL0n5QPzivqxd/R8JW90Hntx4AMCqPg1B/Z9d9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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