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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c385f639bda9d52ea5f078421a0c9deca37cce18d63b0cbc656ea7bd0db5394' 
  AND token = 'A/T/RoTdSji9sdwtMGFzN17Dvb0JnVVci4m48HEU4Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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