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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4fe56d6cb01016fd8ea0fe0e957b8e207495aa7e485692189b83d7087bc46758' 
  AND token = 'CI97GAk2VQ6VlyPaMFB2VPqm3vDQCbDxEh8maLqZ0d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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