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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f48f54aa709c00a5a1678e0ce58e3547c5a56e967db5f034caa082da455e1354' 
  AND token = 'OCSZwO1FwVA5qrW4SIqNxmn2u7/wQe4K+ce4SN7HJCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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