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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '27f7fb0f20cac3494f77ccfb8f9967ad351c8c3f3bc49aa0989b8d3d75b367b8' 
  AND token = 'Rdmq3TMAQUuHqxHUTmWf6tAfEEN9MmjgUKpK2rGz4ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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