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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '00d03230c8c8ae5a102b1b220aa0392bf83aae3c69b28c96f6bf45700c3116ea' 
  AND token = 'w6z2aRWLqZ05sQDPERjaeN3Q+wa/hufAOzR5YDQgxas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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