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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '387a249e1dfb4837693cfd28a83eed0727cbdb6ff51fad545de4e38b459538af' 
  AND token = 'u5zUtn8APrj/vXoSv3e4Yty2FuK8x5PGND8V1r1fd5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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