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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2927b28456c0f18040d32e4fcaa40fbed898e940918db6950727c11e250d29ca' 
  AND token = 'DCs11EeGHv/lPM9AygEXRBeUh7BnfbMPrDgUUB0PMw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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