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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '284314d1627c8eecd142b846637d6827f32f6a6842de8997de783bb08ddbed3c' 
  AND token = 'r7BICARFPTuTbJihgJk6eJpo4fpRSek3tiY4VD49dZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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