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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6df2325dc39f592a215c0e7433eccab16885ba6f548838dbbf8a69ff3a2f774f' 
  AND token = 'MIBoKlKY4gY0o74+s8GXYrHEDxQZt06B49b670cbiQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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