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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03420ef57a6251cff3b5858acc7cc28b1f9c90af7821eab204db95f5fed65c47' 
  AND token = 'Xyg574OpqeKYpLfHIOdvHp2EbJRXh+lsz69rHiG5884=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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