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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '215ec4f9fbe29d2c22b1ed8052d3c6bee34a346a5a830dd8903153f0a5fab707' 
  AND token = 'kfMkQLcvcD/BVuf3jHPOdZdOOBdDF+GN8SAVc+rUyvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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