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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bfc939626fc0170e941b6281ae7ba50819de129267d95b08f7e709c3a7166b97' 
  AND token = 'Z/fVnFUPBsAM01psLMtLy9F3ikY+CjaTGS987qQ2sMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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