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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '448bc66d721ee935101fba9c4c0831b5eeb22266588b5d0e4415a13b54bf1f42' 
  AND token = 'OBZiIeGpGTEyaCJ8wgu1NdiDne50CZQ5YUyNYgYisDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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