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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '52301d008920c51efc305c92a90832b4d2c8473e220cddc4066b7198a70aacba' 
  AND token = '5W6dGnexIZBYM9aNGq6Mc0+isfpcNOcVtkI8HafGbD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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