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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a82ace760d60478e2d70eb03aefce445b956b571b762c5f1602ae4cba1ec74ab' 
  AND token = 'd22Xx5szRYKAnspyNv1uvtpW3uRFSOcFMr70XH20OHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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