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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e4ea5a491186dfc42413b727b6873ad8079624eb7d17f373f0d41967f6e7479' 
  AND token = 'CgqP8S8vHc/GxKka4JXylk2pZT/bH6cI+tBky2kthf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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