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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '63db88e1b6e86b0e4fae869be809b93ae2fa4c6f52a11cf95e0e5523449f024a' 
  AND token = 'HfZ4OBT//EXtzg9YcW5ph1xFkhzFXq0wMScxfonqAN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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